High-Collar Lock Washers

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156 Products

Split Lock Washers for Socket Head Screws

Stop socket head screws from loosening due to mild vibration. These washers have a small diameter to fit under screws with narrow heads, but are still thick enough to keep fasteners secure. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads. Also known as high-collar lock washers.

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers won't rust when exposed to moisture. However, they can't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

Black-Oxide Steel—Typically chosen for their appearance, these washers have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Steel—Best for dry environments since moisture will cause these washers to rust.

	For Screw Size	ID	OD	Thk.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		No. 2	0.094"	0.142"	0.022"	—	100	98437A180	00000


		No. 4	0.120"	0.173"	0.022"	ASME B18.21.1	100	98437A102	0000
		No. 5	0.133"	0.202"	0.030"	ASME B18.21.1	100	98437A160	0000
		No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	100	98437A104	0000
		No. 8	0.174"	0.267"	0.047"	ASME B18.21.1	100	98437A106	0000
		No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	100	98437A108	0000
		No. 12	0.227"	0.331"	0.078"	—	100	98437A190	0000
		1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	100	98437A110	0000
		5/16"	0.322"	0.457"	0.093"	ASME B18.21.1	50	98437A112	0000
		3/8"	0.385"	0.550"	0.125"	ASME B18.21.1	50	98437A115	00000
		7/16"	0.450"	0.644"	0.140"	ASME B18.21.1	50	98437A170	00000


		1/2"	0.512"	0.733"	0.172"	ASME B18.21.1	25	98437A130	0000
		5/8"	0.641"	0.917"	0.203"	ASME B18.21.1	10	98437A135	0000
		3/4"	0.766"	1.105"	0.218"	ASME B18.21.1	10	98437A140	00000
		7/8"	0.894"	1.291"	0.234"	ASME B18.21.1	5	98437A150	00000
		1"	1.024"	1.478"	0.250"	ASME B18.21.1	1	98437A210	0000
		M3	3.4 mm	5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	91111A118	0000
		M3.5	3.9 mm	6.1 mm	0.9 mm to 1.1 mm	DIN 7980	100	91111A119	0000
		M4	4.4 mm	7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	91111A121	0000
		M5	5.4 mm	8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	91111A124	0000
		M6	6.5 mm	9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	91111A129	0000


		M8	8.5 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	91111A132	00000
		M10	10.7 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	91111A135	00000
		M12	12.7 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	50	91111A138	0000
		M14	14.7 mm	21.1 mm	2.8 mm to 3.2 mm	DIN 7980	10	91111A141	0000
		M16	17.0 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	91111A143	0000
		M18	19.0 mm	26.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	91111A145	0000
		M20	21.2 mm	30.6 mm	4.3 mm to 4.7 mm	DIN 7980	10	91111A147	0000
		M22	23.5 mm	32.9 mm	4.3 mm to 4.7 mm	DIN 7980	5	91111A149	00000
		M24	25.5 mm	35.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	91111A151	0000
		M30	31.7 mm	44.1 mm	5.8 mm to 6.2 mm	DIN 7980	1	91111A155	00000


		Black-Oxide 18-8 Stainless Steel



				No. 4	0.120"	0.173"	0.022"	ASME B18.21.1	100	93711A100	00000


				No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	100	93711A200	00000
				No. 8	0.174"	0.267"	0.047"	ASME B18.21.1	100	93711A300	00000
				No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	50	93711A400	0000
				1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	50	93711A500	00000
				5/16"	0.322"	0.457"	0.093"	ASME B18.21.1	25	93711A600	0000
				3/8"	0.385"	0.550"	0.125"	ASME B18.21.1	10	93711A700	0000
				1/2"	0.512"	0.733"	0.172"	ASME B18.21.1	10	93711A800	0000
				5/8"	0.641"	0.917"	0.203"	ASME B18.21.1	5	93711A900	00000
				3/4"	0.766"	1.105"	0.218"	ASME B18.21.1	1	93711A910	0000


				Highly Corrosion-Resistant 316 Stainless Steel



No. 2						0.094"	0.142"	0.022"	—	100	94241A210	0000


No. 4	0.120"					0.173"	0.022"	ASME B18.21.1	100	94241A220	0000
No. 5	0.133"					0.202"	0.030"	ASME B18.21.1	100	94241A230	0000
No. 6	0.148"					0.216"	0.030"	ASME B18.21.1	100	94241A240	0000
No. 8	0.174"					0.267"	0.047"	ASME B18.21.1	100	94241A250	0000
No. 10	0.200"					0.294"	0.047"	ASME B18.21.1	100	94241A260	0000
1/4"	0.260"					0.363"	0.078"	ASME B18.21.1	100	94241A270	0000
5/16"	0.322"					0.457"	0.093"	ASME B18.21.1	50	94241A280	0000
3/8"	0.385"					0.550"	0.125"	ASME B18.21.1	50	94241A290	00000
7/16"	0.450"					0.644"	0.140"	ASME B18.21.1	25	94241A310	00000
1/2"	0.512"					0.733"	0.172"	ASME B18.21.1	10	94241A320	0000


5/8"	0.641"					0.917"	0.203"	ASME B18.21.1	10	94241A330	00000
3/4"	0.766"					1.105"	0.218"	ASME B18.21.1	5	94241A340	00000
7/8"	0.894"					1.291"	0.234"	ASME B18.21.1	1	94241A350	0000
1"	1.024"					1.478"	0.250"	ASME B18.21.1	1	94241A360	0000
1 1/4"	1.280"					1.790"	0.313"	ASME B18.21.1	1	94241A370	0000
1 1/2"	1.534"					2.159"	0.375"	ASME B18.21.1	1	94241A380	00000
M3	3.4 mm					5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	94241A510	0000
M4	4.4 mm					7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	94241A520	0000
M5	5.4 mm					8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	94241A530	0000
M6	6.5 mm					9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	94241A540	0000


M8	8.5 mm					12.7 mm	1.9 mm to 2.1 mm	DIN 7980	50	94241A550	0000
M10	10.7 mm					16.0 mm	2.3 mm to 2.7 mm	DIN 7980	50	94241A560	00000
M12	12.7 mm					18.0 mm	2.3 mm to 2.7 mm	DIN 7980	25	94241A570	0000
M14	14.7 mm					21.1 mm	2.8 mm to 3.2 mm	DIN 7980	10	94241A580	0000
M16	17.0 mm					24.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	94241A590	0000
M18	19.0 mm					26.4 mm	3.3 mm to 3.7 mm	DIN 7980	10	94241A610	0000
M20	21.2 mm					30.6 mm	4.3 mm to 4.7 mm	DIN 7980	1	94241A620	0000
M22	23.5 mm					32.9 mm	4.3 mm to 4.7 mm	DIN 7980	1	94241A630	0000
M24	25.5 mm					35.9 mm	4.8 mm to 5.2 mm	DIN 7980	1	94241A640	0000
M30	31.7 mm					44.1 mm	5.8 mm to 6.2 mm	DIN 7980	1	94241A650	0000


Zinc-Plated Steel



						No. 6	0.148"	0.216"	0.030"	ASME B18.21.1	50	92961A111	0000


		No. 8	0.174"			0.267"	0.042"	ASME B18.21.1	50	92961A112	0000
		No. 10	0.200"			0.294"	0.047"	ASME B18.21.1	50	92961A113	0000
		1/4"	0.260"			0.363"	0.078"	ASME B18.21.1	50	92961A114	0000
		5/16"	0.322"			0.457"	0.093"	ASME B18.21.1	50	92961A115	0000
		3/8"	0.385"			0.550"	0.125"	ASME B18.21.1	50	92961A116	0000
		7/16"	0.450"			0.644"	0.140"	ASME B18.21.1	25	92961A117	00000
		1/2"	0.512"			0.733"	0.172"	ASME B18.21.1	25	92961A118	0000
		5/8"	0.641"			0.917"	0.203"	ASME B18.21.1	25	92961A119	00000
		3/4"	0.766"			1.105"	0.218"	ASME B18.21.1	10	92961A120	0000
		7/8"	0.984"			1.291"	0.234"	ASME B18.21.1	5	92961A121	0000


		1"	1.024"			1.478"	0.250"	ASME B18.21.1	1	92961A122	00000
		M3	3.4 mm			5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	93837A110	0000
		M4	4.4 mm			7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	93837A120	0000
		M5	5.4 mm			8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	93837A130	0000
		M6	6.5 mm	9.9 mm		1.5 mm to 1.7 mm	DIN 7980	100	93837A140	0000
		M8	8.5 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	93837A230	0000
		M10	10.7 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	93837A150	00000
		M12	12.7 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	93837A240	00000
		M14	14.7 mm	21.1 mm	2.8 mm to 3.2 mm	DIN 7980	50	93837A250	0000
		M16	17.0 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	93837A160	0000


		M18	19.0 mm	26.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	93837A170	00000
		M20	21.2 mm	30.6 mm	4.3 mm to 4.7 mm	DIN 7980	10	93837A180	0000
		M24	25.5 mm	35.9 mm	4.8 mm to 5.2 mm	DIN 7980	10	93837A190	0000
		M27	28.5 mm	38.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	93837A260	0000
		M30	31.7 mm	44.1 mm	5.8 mm to 6.2 mm	DIN 7980	5	93837A210	00000
		M36	37.7 mm	52.2 mm	6.7 mm to 7.3 mm	DIN 7980	1	93837A220	0000


		Zinc-Yellow-Chromate-Plated Steel



				M4	4.1 mm	7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	93837A310	0000


				M5	5.1 mm	8.8 mm	1.5 mm to 1.7 mm	DIN 7980	25	93837A320	00000
				M6	6.1 mm	9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	93837A330	0000
				M8	8.1 mm	12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	93837A340	0000
				M10	10.2 mm	16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	93837A350	00000
				M12	12.2 mm	18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	93837A360	00000
				M16	16.2 mm	24.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	93837A370	00000


				Black-Oxide Steel



						No. 4	0.117"	0.173"	0.022"	ASME B18.21.1	50	92962A210	0000


						No. 6	0.145"	0.216"	0.030"	ASME B18.21.1	50	92962A220	0000
						No. 8	0.174"	0.267"	0.042"	ASME B18.21.1	50	92962A111	0000
						No. 10	0.200"	0.294"	0.047"	ASME B18.21.1	50	92962A112	0000
						1/4"	0.260"	0.363"	0.078"	ASME B18.21.1	50	92962A113	0000
5/16"						0.322"	0.457"	0.093"	ASME B18.21.1	50	92962A114	0000
3/8"	0.385"					0.550"	0.125"	ASME B18.21.1	10	92962A115	0000
7/16"	0.450"					0.644"	0.140"	ASME B18.21.1	25	92962A116	0000
1/2"	0.512"					0.733"	0.172"	ASME B18.21.1	25	92962A117	0000
5/8"	0.641"					0.917"	0.203"	ASME B18.21.1	10	92962A118	00000
3/4"	0.766"					1.105"	0.218"	ASME B18.21.1	5	92962A119	0000


7/8"	0.984"					1.291"	0.234"	ASME B18.21.1	5	92962A120	0000
1"	1.024"					1.478"	0.250"	ASME B18.21.1	1	92962A121	0000
1 1/8"	1.153"					1.663"	0.313"	ASME B18.21.1	1	92962A122	0000
1 1/4"	1.280"					1.790"	0.313"	ASME B18.21.1	1	92962A123	0000
M3	3.4 mm					5.6 mm	0.9 mm to 1.1 mm	DIN 7980	100	91190A510	0000
M3.5	3.9 mm					6.1 mm	0.9 mm to 1.1 mm	DIN 7980	100	91190A515	0000
M4	4.4 mm					7.0 mm	1.1 mm to 1.3 mm	DIN 7980	100	91190A520	0000
M5	5.4 mm					8.8 mm	1.5 mm to 1.7 mm	DIN 7980	100	91190A530	0000
M6	6.5 mm					9.9 mm	1.5 mm to 1.7 mm	DIN 7980	100	91190A540	0000
M8	8.5 mm					12.7 mm	1.9 mm to 2.1 mm	DIN 7980	100	91190A550	0000


M10	10.7 mm					16.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	91190A560	00000
M12	12.7 mm					18.0 mm	2.3 mm to 2.7 mm	DIN 7980	100	91190A570	00000
M14	14.7 mm					21.1 mm	2.8 mm to 3.2 mm	DIN 7980	100	91190A580	00000
M16	17.0 mm					24.4 mm	3.3 mm to 3.7 mm	DIN 7980	50	91190A590	00000
M18	19.0 mm					26.4 mm	3.3 mm to 3.7 mm	DIN 7980	25	91190A600	00000
M20	21.2 mm					30.6 mm	4.3 mm to 4.7 mm	DIN 7980	25	91190A610	00000
M22	23.5 mm					32.9 mm	4.3 mm to 4.7 mm	DIN 7980	10	91190A620	0000
M24	25.5 mm					35.9 mm	4.8 mm to 5.2 mm	DIN 7980	10	91190A630	0000
M27	28.5 mm					38.9 mm	4.8 mm to 5.2 mm	DIN 7980	5	91190A650	0000
M30	31.7 mm					44.1 mm	5.8 mm to 6.2 mm	DIN 7980	5	91190A670	0000


M36	37.7 mm					52.2 mm	6.7 mm to 7.3 mm	DIN 7980	1	91190A690	0000
M42	43.7 mm					60.2 mm	7.7 mm to 8.3 mm	DIN 7980	1	91190A660	00000
M48	50.5 mm					67.0 mm	7.7 mm to 8.3 mm	DIN 7980	1	91190A640	00000


Steel



		No. 4	0.120"			0.173"	0.022"	ASME B18.21.1	100	90073A005	0000


		No. 5	0.133"			0.202"	0.030"	ASME B18.21.1	100	90073A006	0000
		No. 6	0.148"			0.216"	0.030"	ASME B18.21.1	100	90073A007	0000
		No. 10	0.200"			0.294"	0.047"	ASME B18.21.1	100	90073A011	0000
		1/4"	0.260"			0.363"	0.078"	ASME B18.21.1	100	90073A029	0000
		5/16"	0.322"			0.457"	0.093"	ASME B18.21.1	100	90073A030	0000
		3/8"	0.385"			0.550"	0.125"	ASME B18.21.1	100	90073A231	0000
		7/16"	0.450"			0.644"	0.140"	ASME B18.21.1	100	90073A234	00000
		1/2"	0.512"			0.733"	0.172"	ASME B18.21.1	100	90073A237	00000
		5/8"	0.641"			0.917"	0.203"	ASME B18.21.1	50	90073A240	00000
		3/4"	0.766"			1.105"	0.218"	ASME B18.21.1	25	90073A243	00000


		7/8"	0.894"	1.291"	0.234"	ASME B18.21.1	25	90073A246	00000
		1"	1.024"	1.478"	0.250"	ASME B18.21.1	10	90073A038	0000
		1 1/8"	1.153"	1.663"	0.313"	ASME B18.21.1	5	90073A333	00000
		1 1/4"	1.280"	1.790"	0.313"	ASME B18.21.1	10	90073A040	00000
		1 1/2"	1.534"	2.159"	0.375"	ASME B18.21.1	5	90073A042	00000